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  #1  
Old 12-01-2011, 02:07 PM
MrMischiefVIP MrMischiefVIP is offline
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QuadraDrive II, experiencing crow hop

Crow hop as defined by Jeep.com: Vehicle shudder and tire scuffing due to a binding condition in the driveline. Usually caused by operating in basic 4WD or part-time 4WD modes on dry pavement.

So I test drove a Commander with QuadraDrive II. I understand how this system functions, but I noticed mild crow hop when performing tight turns. Not as severe as my Rubicon would be on the same surface in 4x4, but it was there. Is this normal with QuadraDrive II? Part of me finds it reassuring. I know 4 wheel drive is functioning to some degree because it's doing this. But, I expected Jeep would have done their best to engineer crow hop out of the system when it's not in low range. I can just imagine how many people would be in a panic at the dealer because of it.
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Old 12-01-2011, 04:09 PM
thance thance is offline
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Quote:
Originally Posted by MrMischiefVIP View Post
Crow hop as defined by Jeep.com: Vehicle shudder and tire scuffing due to a binding condition in the driveline. Usually caused by operating in basic 4WD or part-time 4WD modes on dry pavement.

So I test drove a Commander with QuadraDrive II. I understand how this system functions, but I noticed mild crow hop when performing tight turns. Not as severe as my Rubicon would be on the same surface in 4x4, but it was there. Is this normal with QuadraDrive II? Part of me finds it reassuring. I know 4 wheel drive is functioning to some degree because it's doing this. But, I expected Jeep would have done their best to engineer crow hop out of the system when it's not in low range. I can just imagine how many people would be in a panic at the dealer because of it.
How fast were you going around the tight turn. QDII has traction control in the front and rear with both electronically controlled limited slip differentials as well as individual abs at the wheel level.

Basically the system does everything it can to prevent wheel slippage and ensure straight tracking (reduce under steer / over steer).

So if you were trying to power around a tight corner it might of been locking up an individual wheel or tieing both wheels on the axle together as it saw fit to prevent slippage. Overall these systems work extreemly well and rarely slow you down or are even noticeable.

One execption I've seen (with QTII) is when making a sharp right turn where the left side is sloped down on an icy/snowy surface you can get some clicking and clunking. From what I've heard, the QDII doesn't do this, or at least not so much.

If it was dry pavement and you were moving slowly there might be an issue with the vehicle you tested.
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Old 12-01-2011, 06:40 PM
MrMischiefVIP MrMischiefVIP is offline
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dry pavement, sharp left turn in a cul-de-sac, at idle. I suppose it is slightly downhill as you come around, but nothing severe. I did not buy this vehicle for other reasons, but going out to test another one maybe on Saturday. I'll be sure to test it again and see if this other vehicle does it as well. Thanks for the input.
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Old 12-01-2011, 08:21 PM
toxicity_27 toxicity_27 is offline
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I've never noticed anything like that in my Commander. The only time it does anything is when the ESP is kicking on when the roads are icy/snowy.
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Old 12-01-2011, 09:34 PM
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Gulf550 Gulf550 is offline
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I have no problem in mine. I even have a 4" lift and have no engagement like that.
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Old 12-02-2011, 06:01 AM
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I am assuming you are experiencing 'crow hop' with the transfer case in the normal high range.
If this is the case, thats a bit unusual.
Do make certain there is no mismatch regarding tire size and brand.

Testing in low range on dry ground will make it 'crow hop' and sometimes a loud bang as the driveline snatches and unloads......horrible sounds coming from a very unhappy transfer case.

Rob
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Old 12-02-2011, 08:28 AM
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rblapham rblapham is offline
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You didn't say what year your commander was. My 06 did that (Lock Shudder) and there was a TSB on it to change the oil in the Transfer case to a new oil. I put in the new oil and it stopped the hop. The oil is a dealer part only and about $17 did it. Oil for the transfer case is NV245 (QT-II & QD-II): 1.8L (3.8 pts.) For 06 and probably newer also, check your owners manual.
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Old 12-02-2011, 02:07 PM
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Quote:
Originally Posted by MrMischiefVIP View Post
Crow hop as defined by Jeep.com: Vehicle shudder and tire scuffing due to a binding condition in the driveline. Usually caused by operating in basic 4WD or part-time 4WD modes on dry pavement.

So I test drove a Commander with QuadraDrive II. I understand how this system functions, but I noticed mild crow hop when performing tight turns. Not as severe as my Rubicon would be on the same surface in 4x4, but it was there. Is this normal with QuadraDrive II? Part of me finds it reassuring. I know 4 wheel drive is functioning to some degree because it's doing this. But, I expected Jeep would have done their best to engineer crow hop out of the system when it's not in low range. I can just imagine how many people would be in a panic at the dealer because of it.
You mention your Rubicon doing it on a dry surface in 4x4..... Did you engage the low range transfer case on the Commander????

If so....and on dry pavement.... it would be hopping all over the place.

The Commander is always 4wd, but when you put it in low range (pull up on the "T" handle) the front and rear axles are tied together....this will cause all kinds of hopping and banging on dry surfaces.
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Old 12-03-2011, 05:16 PM
Beemer9 Beemer9 is offline
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I'm assuming your not test driving a new commander as they've been discontinued.
With QDII the ELSD front and rear differentials require a Chrysler anti friction additve.
If the axles have been serviced w/o the correct lube, you can get some binding/release in the clutch packs., most notable in tight turns.
This would happen in either Hi or Lo range.
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Old 12-03-2011, 09:50 PM
MrMischiefVIP MrMischiefVIP is offline
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Quote:
Originally Posted by rblapham View Post
You didn't say what year your commander was. My 06 did that (Lock Shudder) and there was a TSB on it to change the oil in the Transfer case to a new oil. I put in the new oil and it stopped the hop. The oil is a dealer part only and about $17 did it. Oil for the transfer case is NV245 (QT-II & QD-II): 1.8L (3.8 pts.) For 06 and probably newer also, check your owners manual.
06. it's not on a Jeep lot so I'm sure not much had been done to it

Quote:
Originally Posted by thance View Post
You mention your Rubicon doing it on a dry surface in 4x4..... Did you engage the low range transfer case on the Commander????
I did, but the crow hop I'm concerned about occurred in "high range"

Quote:
Originally Posted by Beemer9 View Post
I'm assuming your not test driving a new commander as they've been discontinued.
With QDII the ELSD front and rear differentials require a Chrysler anti friction additve.
If the axles have been serviced w/o the correct lube, you can get some binding/release in the clutch packs., most notable in tight turns.
This would happen in either Hi or Lo range.
Yes, it was an 06, not new because as you said the last model year sold was a 2010 and we're now at the end of 2011. A new 2010 with the hemi would be a great find for someone.
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